Outlaw eating commanding officer's food (5)
I believe the answer is:
leper
'outlaw' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for leper that I've seen before include "skin disease" , "Undesirable" , "Social reject" , "This person unwanted by society" , "sick person" .)